Offa's Dyke may be 300 years older than is thought

Britain's longest ancient monument may be 300 years old older than thought - and built by generations before the king who gave it his name.

Offa's Dyke, which runs 177 miles along the England-Wales border, was named after the 8th century Anglo-Saxon king of Mercia.

But historians have discovered the building of the dyke could possibly have begun between 430 and 650 AD - up to 300 years before Offa ruled the land.

Offa's Dyke may date back to 300 years before Offa came to the throne and was credited with building the ancient barrier between England and Wales
Historians discovered dyke could have been built between 430 and 650 AD
Archaeologists will find charcoal deposits that could show when it was made
The dyke could have been constructed by an earlier king many years before Offa